From af1839d722c986ffeaae1e70a6ef1c75ff38dcd5 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Tue, 21 Jan 2014 15:51:01 -0800 Subject: mm: numa: trace tasks that fail migration due to rate limiting A low local/remote numa hinting fault ratio is potentially explained by failed migrations. This patch adds a tracepoint that fires when migration fails due to migration rate limitation. Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel Cc: Alex Thorlton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/migrate.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/migrate.c b/mm/migrate.c index 4612bb2e3677..f9e16350d09c 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1614,8 +1614,11 @@ static bool numamigrate_update_ratelimit(pg_data_t *pgdat, msecs_to_jiffies(migrate_interval_millisecs); spin_unlock(&pgdat->numabalancing_migrate_lock); } - if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) + if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) { + trace_mm_numa_migrate_ratelimit(current, pgdat->node_id, + nr_pages); return true; + } /* * This is an unlocked non-atomic update so errors are possible. -- cgit v1.2.3